14. Students Norma Lee and Rangh are discussing force and motionas discussed in class.
(The question didn't specify if the speed is constant ornot, please list both possibilities.) Norma is describingthe motion of a cart on a level frictionless track and identifyingthe
forces acting on the cart. She has listed gravity, the trackpushing upward and a push in
the direction of motion as acting when the cart is coasting downthe track.
Lee is puzzling over a case of circular motion and how a ballmoving in a circle with constant
speed can have a net force acting when the speed is notchanging.
Ă‚Â Ă‚Â Rangh replies that it might help if they considerwhat object is exerting each force.
Analyze the three students’ statements, identifying what iswrong or right BASED ON YOUR LAB EXPERIENCE AND DATA and knowledgeof physics principles.
